Figure 8 display the highlighted 9 pin connector J304 on bottom side of SoM_IoT_2V0 printed circuit board. This connector allocate the large-scale integrated circuit R-IN32M3-EC with external SPI and additional Timer Array Unit signals.
Pin 19 (TAUJ2_CH0)
Pin 20
Pin 21 Timer Array Unit channel 0. This pin can be used as input TAUJ2TTIN0 or as output TAUJ2TTOUT0. This pin is multiplexed on port P27 of R-IN32M3-EC. For interrupts and peripheral modulessee also User’s Manual R18UZ0007EJ1100 chapter 14 Timer Array Unit (TAUJ2)
Pin 20 (TAUJ2_CH1) Timer Array Unit channel 1. This pin can be used as input TAUJ2TTIN1 or as output TAUJ2TTOUT1. This pin is multiplexed on port P26 of R-IN32M3-EC.
Pin 21 (TAUJ2_CH2) Timer Array Unit channel 2. This pin can be used as input TAUJ2TTIN2 or as output TAUJ2TTOUT2. This pin is multiplexed on port P57 of R-IN32M3-EC.
Pin 22 (GND) optional Ground
Pin 23 (SPI_RST1) is used as reset input for the Clocked Serial Interface H 1 and is internally connected to R-IN32M3-EC Port P75.
Pin 24 (SPI_SCK1) complies the SCK function for SPI connection. This channel 1 CSIHTSCK signal connect the serial clock of R-IN32M3-EC at Port P35. For interrupts and peripheral modulessee also User’s Manual R18UZ0007EJ1100 chapter 17 Clocked Serial Interface H (CSIH)
Pin 25 (SPI_MOSI1) complies the MOSI function for SPI connection. This pin connect the R-IN32M3-EC serial data input signal at Port P36 (CSISI1).
Pin 26 (SPI_MISO1) complies the MISO function for SPI connection. This pin connect the R-IN32M3-EC serial data output signal at Port P37 (CSISO1).
Pin 27 (SPI_CS1) has chip select (CS) function for R-IN32M3-EC Clocked Serial Interface H 1 (CSIH1) which works in Slave Mode at CSIHTCSS1 channel 1. The used chip select sink for this R-IN32M3-EC based module is Port P72.